闽江河口湿地典型植物群落空间扩展中铁含量变化特征  

Variations of Iron Content in the Spatial Expansion of Typical Plant Communities in the Min River Estuary

作　　者：米慧珊 翟水晶[1,2] 高会[1,2] 何涛[1,2] 孙志高[1,2] 田莉萍[1,2] 胡星云 MI Hui-shan;ZHAI Shui-jing;GAO Hui;HE Tao;SUN Zhi-gao;TIAN Li-ping;HU Xing-yun(State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province,Fujian Normal University,Fuzhou 350007,China;School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China)

机构地区：[1]福建师范大学湿润亚热带山地生态国家重点实验室培育基地,福建福州350007 [2]福建师范大学地理科学学院,福建福州350007

出　　处：《福建师范大学学报（自然科学版）》2018年第6期53-62,共10页Journal of Fujian Normal University：Natural Science Edition

基　　金：福建省财政厅;科技厅资助项目(2016J01184);福建省公益类科研院所重点项目(2016R10321)

摘　　要：2015年7月,选取闽江河口鳝鱼滩的芦苇湿地、短叶茳芏湿地以及二者交错带湿地为对象,研究了两种植被空间扩展过程中土壤-植物系统铁(Fe)含量的空间变化特征.结果表明:水平方向上不同湿地土壤Fe含量整体表现为交错带湿地>芦苇湿地>短叶茳芏湿地;垂直方向上土壤Fe含量上层(0~30cm)高于下层(30~60 cm),且交错带湿地变化趋势与芦苇湿地大体一致;这可能与土壤有机质的差异和生长植物类型有关;而且土壤含水量的影响也导致土壤Fe含量周期性淹水湿地(A样带)>长期性淹水湿地(B样带).不同植物地下根系Fe含量均高于地上部分,短叶茳芏Fe含量与根系Fe储量分配比整体高于芦苇,而芦苇地上部分Fe储量分配比高于短叶茳芏.芦苇与短叶茳芏在空间相互扩展过程中,芦苇Fe含量及累积能力在周期性淹水湿地中均提高,短叶茳芏则下降,而长期淹水环境下芦苇根系Fe累积能力下降,短叶茳芏则通过适应淹水环境提高Fe累积能力来抗衡芦苇的空间扩展.To investigate the variations in iron （Fe） content in soil-plant systems ol k＇hrag- mites australis and Cyperus malaccensis in the process of their spatial expansion in Shanyutan marsh of the Min River estuary, the P. australis marsh （ PM ） , C. malaccensis marsh （ CM ） , and their ecotonal marsh （P. australis-C, malaccensis, PCM） were studied in July 2015. Results showed that Fe content in soils of different marshes were generally showed in the order of PCM 〉 PM 〉 CM in the horizontal direction; Fe content in soils of the upper layer （0 -30 cm） was higher than that of the deeper layer （30 -60 cm） , and variation in PCM was consistent with the PM. This may be related to the difference of soil organic matter and plant species. Moreover, soil moisture also led to the Fe content in soils characterized by the periodic flooded marshes （transect A ） 〉 long-term flooded marshes （transect B）. Fe content in roots of different plants was higher than that in aboveground part. Fe content and allocation ratio of Fe stock in roots of C. malaccensis were higher than that of P. australis, while allocation ratio of Fe stock in aboveground showed the opposite trend. In the process of spatial expansion of P. australis and C. malaccensis, Fe content and accumulation capacity of P. australis increased in the periodic flooded marshes but Fe content and accumulation capacity of C. malaccensis decreased. Fe accumulation capacity in roots of P. australis decreased in the long- term flooded marshes, and C. malaccensis was able to resist the spatial expansion of P. australis by adapting to the flooded environment and increasing Fe accumulation capacity.

关 键 词：铁 土壤-植物系统 空间扩展 湿地 闽江河口 

分 类 号：P595[天文地球—地球化学]